Wiese, Melanie; Van Heerden, Cornelius Hendrik, 1957-; Van Heerden, Neels, 1957-; Jordaan, Yolanda(University of Johannesburg, Department of Business Management, 2010)
Van Heerden, Cornelius Hendrik, 1957-; Van Heerden, Neels, 1957-(Africa Association for Health, Physical Education, Recreation, Sport and Dance, 2005-09)
Van Heerden, Cornelius Hendrik, 1957-; Van Heerden, Neels, 1957-(Africa Association for Health, Physical Education, Recreation, Sport and Dance, 2003-10)